Add caching to CI (#358)

Leverage GitHub Actions caching to cache dependencies between CI runs and reduce overall CI run times.

.github/workflows/ci.yml

@@ -25,20 +25,40 @@ jobs:
  with:
  submodules: true
 
- - run: |
+ - name: Install system dependencies
+ run: |
  sudo apt update
  sudo apt install -y libkrb5-dev
  if: matrix.os == 'ubuntu-latest'
 
- - uses: actions-rs/toolchain@v1
+ - name: Install Rust toolchain
+ uses: actions-rs/toolchain@v1
  with:
  profile: minimal
  toolchain: "1.46.0"
  default: true
 
- - run: cargo test --features ${{ env.FEATURES }},spnego,unstable-interceptors
+ - name: Update Cargo.lock
+ run: cargo update
+
+ - name: Cache Cargo dependencies
+ uses: actions/cache@v2
+ with:
+ path: |
+ ~/.cargo/bin/
+ ~/.cargo/registry/index/
+ ~/.cargo/registry/cache/
+ ~/.cargo/git/db/
+ target/
+ key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
+ restore-keys: |
+ cargo-${{ runner.os }}-
+
+ - name: Run tests
+ run: cargo test --features ${{ env.FEATURES }},spnego,unstable-interceptors
 
- - run: cargo run --release --example simple
+ - name: Run example program
+ run: cargo run --release --example simple
 
  analyze:
  runs-on: ubuntu-latest
@@ -55,6 +75,22 @@ jobs:
  components: clippy
  default: true
 
+ - name: Update Cargo.lock
+ run: cargo update
+
+ - name: Cache Cargo dependencies
+ uses: actions/cache@v2
+ with:
+ path: |
+ ~/.cargo/bin/
+ ~/.cargo/registry/index/
+ ~/.cargo/registry/cache/
+ ~/.cargo/git/db/
+ target/
+ key: cargo-${{ runner.os }}-${{ hashFiles('**/Cargo.lock') }}
+ restore-keys: |
+ cargo-${{ runner.os }}-
+
  - name: Check Clippy lints
  uses: actions-rs/clippy-check@v1
  with: